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      <a href="/2017/04/29/three-notes-5-add-mouse-move/" title="three.js笔记5--添加鼠标移动视角" itemprop="url">three.js笔记5--添加鼠标移动视角</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2017-04-29T01:48:34.000Z" itemprop="datePublished">2017-04-29</time>
    更新日期:<time datetime="2018-12-18T15:39:22.520Z" itemprop="dateModified">2018-12-18</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#添加鼠标移动控制"><span class="toc-number">1.</span> <span class="toc-text">添加鼠标移动控制</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#基本思路"><span class="toc-number">1.1.</span> <span class="toc-text">基本思路</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加监听事件"><span class="toc-number">1.2.</span> <span class="toc-text">添加监听事件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#绑定视角更新（照相机焦点处理）"><span class="toc-number">1.3.</span> <span class="toc-text">绑定视角更新（照相机焦点处理）</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#调整照相机移动方向"><span class="toc-number">1.4.</span> <span class="toc-text">调整照相机移动方向</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#完整代码"><span class="toc-number">1.5.</span> <span class="toc-text">完整代码</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
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		<p>Three.js是一个3D库，《three.js笔记》系列是在使用three.js中的一些过程和笔记。<br>本文记录添加鼠标事件，以及调整照相机按照视角进行前后左右移动的基本过程。<br><a id="more"></a></p>
<h2 id="添加鼠标移动控制"><a href="#添加鼠标移动控制" class="headerlink" title="添加鼠标移动控制"></a>添加鼠标移动控制</h2><hr>
<h3 id="基本思路"><a href="#基本思路" class="headerlink" title="基本思路"></a>基本思路</h3><p>这里我们将添加鼠标移动的处理，来控制第一人称（照相机）的视角的移动，基本思路为：</p>
<ul>
<li>添加监听事件</li>
<li>绑定视角更新（照相机焦点处理）</li>
<li>调整照相机移动方向</li>
</ul>
<p>这里我们添加几个全局变量：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 定义角度</span></div><div class="line"><span class="keyword">var</span> theta = <span class="number">0</span>;</div><div class="line"><span class="comment">// 初始化鼠标X方向移动值</span></div><div class="line"><span class="keyword">var</span> mouseX = <span class="number">0</span>;</div><div class="line"><span class="keyword">var</span> r = <span class="number">1000</span> / (<span class="number">2</span>* <span class="built_in">Math</span>.PI); <span class="comment">// 用于角度计算： 鼠标移动1000px时，角度改变2PI</span></div><div class="line"><span class="keyword">var</span> far = <span class="number">20000</span>; <span class="comment">// 用于照相机焦点设置（焦点距离，越大越精确）</span></div><div class="line"><span class="keyword">var</span> move = <span class="number">0.1</span>; <span class="comment">// 用于步长（照相机移动距离）</span></div></pre></td></tr></table></figure>
<p>其中theta(θ)角度如图：<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1486987535%281%29.png" alt="image"></p>
<h3 id="添加监听事件"><a href="#添加监听事件" class="headerlink" title="添加监听事件"></a>添加监听事件</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 添加鼠标移动时事件</span></div><div class="line"><span class="built_in">document</span>.addEventListener(<span class="string">'mousemove'</span>, handleMousemove, <span class="literal">false</span>);</div><div class="line"><span class="comment">// 添加鼠标进入页面时初始化鼠标位置</span></div><div class="line"><span class="built_in">document</span>.addEventListener(<span class="string">'mouseenter'</span>, initMousePosition, <span class="literal">false</span>);</div></pre></td></tr></table></figure>
<p>为了正确获取鼠标左右移动距离，我们在鼠标进入页面时会更新鼠标位置：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 初始化鼠标移动值</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">initMousePosition</span>(<span class="params">e</span>) </span>&#123;</div><div class="line">    mouseX = getMousePos(e || <span class="built_in">window</span>.event);</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>然后我们获取鼠标移动距离，这里我们需要处理鼠标位置的兼容性：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 获取鼠标坐标，传入事件event</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">getMousePos</span>(<span class="params">event</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> e = event || <span class="built_in">window</span>.event;</div><div class="line">    <span class="keyword">var</span> scrollX = <span class="built_in">document</span>.documentElement.scrollLeft || <span class="built_in">document</span>.body.scrollLeft;</div><div class="line">    <span class="keyword">var</span> scrollY = <span class="built_in">document</span>.documentElement.scrollTop || <span class="built_in">document</span>.body.scrollTop;</div><div class="line">    <span class="keyword">var</span> x = e.pageX || e.clientX + scrollX;</div><div class="line">    <span class="keyword">var</span> y = e.pageY || e.clientY + scrollY;</div><div class="line">    <span class="keyword">return</span> &#123; <span class="string">'x'</span>: x, <span class="string">'y'</span>: y &#125;;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="comment">// 处理鼠标移动</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">handleMousemove</span>(<span class="params">e</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> e = e || <span class="built_in">window</span>.event;</div><div class="line">    <span class="comment">// 获取鼠标x坐标</span></div><div class="line">    <span class="keyword">var</span> newMouseX = getMousePos(e).x;</div><div class="line">    <span class="comment">// 若值无效，更新坐标然后返回</span></div><div class="line">    <span class="keyword">if</span> (<span class="built_in">Number</span>.isNaN((newMouseX - mouseX) / r)) &#123; mouseX = newMouseX; <span class="keyword">return</span>; &#125;</div><div class="line">    <span class="comment">// 更新视角以及坐标位置</span></div><div class="line">    theta += (newMouseX - mouseX) / r;</div><div class="line">    mouseX = newMouseX;</div><div class="line"></div><div class="line">    <span class="comment">// 更新照相机焦点</span></div><div class="line">    renderCameraLookat();</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h3 id="绑定视角更新（照相机焦点处理）"><a href="#绑定视角更新（照相机焦点处理）" class="headerlink" title="绑定视角更新（照相机焦点处理）"></a>绑定视角更新（照相机焦点处理）</h3><p>至于照相机焦点的更新，我们设置焦距为far，这里初始化为20000，根据theta角度我们可以计算得到：<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1486987997%281%29.png" alt="image"></p>
<p>即照相机焦点的坐标等于：<br><code>焦点的x轴坐标 = 照相机x轴坐标 + 焦距far × sin(theta)</code><br><code>焦点的y轴坐标 = 照相机y轴坐标 + 焦距far × cos(theta)</code></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 更新照相机焦点</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">renderCameraLookat</span>(<span class="params"></span>) </span>&#123;</div><div class="line">    camera.lookAt(<span class="keyword">new</span> THREE.Vector3(camera.position.x + far * <span class="built_in">Math</span>.sin(theta), camera.position.y + far * <span class="built_in">Math</span>.cos(theta), <span class="number">1</span>));</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h3 id="调整照相机移动方向"><a href="#调整照相机移动方向" class="headerlink" title="调整照相机移动方向"></a>调整照相机移动方向</h3><p>当我们照相机拥有了视觉角度之后，我们的移动方向也不再是x、y这样的简单方向了。</p>
<p>如图：<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1486988752%281%29.png" alt="image"></p>
<p>我们步长为move，则我们移动的计算公式为：</p>
<ul>
<li>往前forward：</li>
</ul>
<p><code>移动后x轴坐标 = 照相机x轴坐标 + 步长move × sin(θ)</code><br><code>移动后y轴坐标 = 照相机y轴坐标 + 步长move × cos(θ)</code></p>
<ul>
<li>往左left：</li>
</ul>
<p><code>移动后x轴坐标 = 照相机x轴坐标 - 步长move × cos(θ)</code><br><code>移动后y轴坐标 = 照相机y轴坐标 + 步长move × sin(θ)</code></p>
<ul>
<li>往后backward则与往前相反：</li>
</ul>
<p><code>移动后x轴坐标 = 照相机x轴坐标 - 步长move × sin(θ)</code><br><code>移动后y轴坐标 = 照相机y轴坐标 - 步长move × cos(θ)</code></p>
<ul>
<li>往右right则与往左相反：</li>
</ul>
<p><code>移动后x轴坐标 = 照相机x轴坐标 + 步长move × cos(θ)</code><br><code>移动后y轴坐标 = 照相机y轴坐标 - 步长move × sin(θ)</code></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 照相机移动计算，值可能为left/forward/right/backward</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">CameraMove</span>(<span class="params">direction</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> x, y;</div><div class="line">    <span class="keyword">var</span> oX = camera.position.x, oY = camera.position.y;</div><div class="line">    <span class="keyword">switch</span> (direction) &#123;</div><div class="line">        <span class="keyword">case</span> <span class="string">'left'</span>:</div><div class="line">            x = oX - move * <span class="built_in">Math</span>.cos(theta);</div><div class="line">            y = oY + move * <span class="built_in">Math</span>.sin(theta);</div><div class="line">            <span class="keyword">break</span>;</div><div class="line">        <span class="keyword">case</span> <span class="string">'forward'</span>:</div><div class="line">            x = oX + move * <span class="built_in">Math</span>.sin(theta);</div><div class="line">            y = oY + move * <span class="built_in">Math</span>.cos(theta);</div><div class="line">            <span class="keyword">break</span>;</div><div class="line">        <span class="keyword">case</span> <span class="string">'right'</span>:</div><div class="line">            x = oX + move * <span class="built_in">Math</span>.cos(theta);</div><div class="line">            y = oY - move * <span class="built_in">Math</span>.sin(theta);</div><div class="line">            <span class="keyword">break</span>;</div><div class="line">        <span class="keyword">case</span> <span class="string">'backward'</span>:</div><div class="line">            x = oX - move * <span class="built_in">Math</span>.sin(theta);</div><div class="line">            y = oY - move * <span class="built_in">Math</span>.cos(theta);</div><div class="line">            <span class="keyword">break</span>;</div><div class="line">    &#125;</div><div class="line">    camera.position.x = x;</div><div class="line">    camera.position.y = y;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>到这里，我们鼠标移动部分的逻辑代码则完成了。</p>
<h3 id="完整代码"><a href="#完整代码" class="headerlink" title="完整代码"></a>完整代码</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div 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class="line">184</div><div class="line">185</div><div class="line">186</div><div class="line">187</div><div class="line">188</div><div class="line">189</div><div class="line">190</div><div class="line">191</div><div class="line">192</div><div class="line">193</div><div class="line">194</div><div class="line">195</div><div class="line">196</div><div class="line">197</div><div class="line">198</div><div class="line">199</div><div class="line">200</div><div class="line">201</div><div class="line">202</div><div class="line">203</div><div class="line">204</div><div class="line">205</div><div class="line">206</div><div class="line">207</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 定义角度</span></div><div class="line"><span class="keyword">var</span> theta = <span class="number">0</span>;</div><div class="line"><span class="comment">// 初始化鼠标X方向移动值</span></div><div class="line"><span class="keyword">var</span> mouseX = <span class="number">0</span>;</div><div class="line"><span class="keyword">var</span> r = <span class="number">1000</span> / (<span class="number">2</span>* <span class="built_in">Math</span>.PI); <span class="comment">// 用于角度计算： 鼠标移动1000px时，角度改变2PI</span></div><div class="line"><span class="keyword">var</span> far = <span class="number">20000</span>; <span class="comment">// 用于照相机焦点设置（焦点距离，越大越精确）</span></div><div class="line"><span class="keyword">var</span> move = <span class="number">0.1</span>; <span class="comment">// 用于步长（照相机移动距离）</span></div><div class="line"></div><div class="line"><span class="comment">// 设置场景</span></div><div class="line"><span class="keyword">var</span> scene = <span class="keyword">new</span> THREE.Scene();</div><div class="line"></div><div class="line"><span class="comment">// 创建正交投影照相机</span></div><div class="line"><span class="keyword">var</span> camera = <span class="keyword">new</span> THREE.PerspectiveCamera(<span class="number">75</span>, <span class="built_in">window</span>.innerWidth / <span class="built_in">window</span>.innerHeight, <span class="number">0.1</span>, <span class="number">1000</span>)</div><div class="line">camera.position.set( <span class="number">0</span>,<span class="number">-5</span>, <span class="number">1</span>);</div><div class="line">camera.up = <span class="keyword">new</span> THREE.Vector3(<span class="number">0</span>,<span class="number">0</span>,<span class="number">1</span>);</div><div class="line">camera.lookAt(<span class="keyword">new</span> THREE.Vector3(<span class="number">0</span>,<span class="number">0</span>,<span class="number">1</span>));</div><div class="line"></div><div class="line"><span class="comment">// 定义着色器</span></div><div class="line"><span class="keyword">var</span> renderer = <span class="keyword">new</span> THREE.WebGLRenderer()</div><div class="line">renderer.setSize(<span class="built_in">window</span>.innerWidth, <span class="built_in">window</span>.innerHeight)</div><div class="line"><span class="built_in">document</span>.body.appendChild(renderer.domElement)</div><div class="line"><span class="comment">// 告诉渲染器渲染阴影</span></div><div class="line">renderer.shadowMap.enabled = <span class="literal">true</span></div><div class="line">renderer.shadowMap.type = THREE.PCFSoftShadowMap</div><div class="line"></div><div class="line"><span class="comment">// 添加地板</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">initFloor</span>(<span class="params"></span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> floorGeo = <span class="keyword">new</span> THREE.PlaneBufferGeometry(<span class="number">12</span>, <span class="number">8</span>, <span class="number">1</span>, <span class="number">1</span>)</div><div class="line">    <span class="keyword">var</span> floorMaterial = <span class="keyword">new</span> THREE.MeshStandardMaterial(&#123; <span class="attr">color</span>: <span class="string">'#aaaaaa'</span> &#125;)</div><div class="line">    <span class="keyword">var</span> floor = <span class="keyword">new</span> THREE.Mesh(floorGeo, floorMaterial)</div><div class="line">    floor.position.set(<span class="number">0</span>, <span class="number">0</span>, <span class="number">-1</span>)</div><div class="line">    floor.receiveShadow = <span class="literal">true</span>; <span class="comment">// 接受阴影</span></div><div class="line">    scene.add(floor)</div><div class="line">    <span class="keyword">return</span> floor</div><div class="line">&#125;</div><div class="line"><span class="keyword">var</span> floor = initFloor()</div><div class="line"></div><div class="line"><span class="comment">// 添加物体</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">initCube</span>(<span class="params">imageUrl</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> geometry = <span class="keyword">new</span> THREE.BoxGeometry(<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>)</div><div class="line">    <span class="keyword">var</span> material</div><div class="line">    <span class="keyword">if</span> (imageUrl) &#123;</div><div class="line">        material = <span class="keyword">new</span> THREE.MeshLambertMaterial(&#123;</div><div class="line">            <span class="attr">map</span>: THREE.ImageUtils.loadTexture(imageUrl)</div><div class="line">        &#125;)</div><div class="line">    &#125; <span class="keyword">else</span> &#123;</div><div class="line">        material = <span class="keyword">new</span> THREE.MeshLambertMaterial()</div><div class="line">    &#125;</div><div class="line">    <span class="keyword">var</span> cube = <span class="keyword">new</span> THREE.Mesh(geometry, material)</div><div class="line">    cube.castShadow = <span class="literal">true</span>; <span class="comment">// 要产生阴影</span></div><div class="line">    scene.add(cube)</div><div class="line">    <span class="keyword">return</span> cube</div><div class="line">&#125;</div><div class="line"><span class="comment">// 添加物体</span></div><div class="line"><span class="keyword">var</span> cube1 = initCube(<span class="string">'./img/1.jpg'</span>)</div><div class="line"><span class="keyword">var</span> cube2 = initCube(<span class="string">'./img/2.png'</span>)</div><div class="line"><span class="keyword">var</span> cube3 = initCube()</div><div class="line"><span class="keyword">var</span> cube4 = initCube()</div><div class="line">cube1.position.set(<span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>)</div><div class="line">cube2.position.set(<span class="number">-2</span>, <span class="number">0</span>, <span class="number">0</span>)</div><div class="line">cube3.position.set(<span class="number">0</span>, <span class="number">-2</span>, <span class="number">1</span>)</div><div class="line">cube4.position.set(<span class="number">1</span>, <span class="number">1</span>, <span class="number">3</span>)</div><div class="line"></div><div class="line"><span class="comment">// 添加聚光灯光源</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">initLight</span>(<span class="params"></span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> light = <span class="keyword">new</span> THREE.SpotLight(<span class="number">0xffffff</span>)</div><div class="line">    light.position.set(<span class="number">0</span>, <span class="number">-3</span>, <span class="number">4</span>)</div><div class="line">    light.target = floor; <span class="comment">// 投射方向指向地板</span></div><div class="line">    light.castShadow = <span class="literal">true</span>; <span class="comment">// 用于产生阴影</span></div><div class="line">    scene.add(light)</div><div class="line">    <span class="comment">// 光源的阴影设置</span></div><div class="line">    light.shadow.mapSize.width = <span class="number">512</span> <span class="comment">// default</span></div><div class="line">    light.shadow.mapSize.height = <span class="number">512</span> <span class="comment">// default</span></div><div class="line">    light.shadow.camera.near = <span class="number">0.5</span> <span class="comment">// default</span></div><div class="line">    light.shadow.camera.far = <span class="number">500</span> <span class="comment">// default</span></div><div class="line">    <span class="keyword">var</span> helper = <span class="keyword">new</span> THREE.CameraHelper(light.shadow.camera)</div><div class="line">    scene.add(helper)</div><div class="line">&#125;</div><div class="line">initLight()</div><div class="line"></div><div class="line"><span class="comment">// 让世界动起来</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">render</span>(<span class="params"></span>) </span>&#123;</div><div class="line">    requestAnimationFrame(render)</div><div class="line"></div><div class="line">    <span class="comment">// 此处可添加动画处理</span></div><div class="line">    cube1.rotation.x += <span class="number">0.03</span></div><div class="line">    cube1.rotation.y += <span class="number">0.03</span></div><div class="line"></div><div class="line">    cube2.rotation.x += <span class="number">0.02</span></div><div class="line">    cube3.rotation.y += <span class="number">0.01</span></div><div class="line">    cube4.rotation.x -= <span class="number">0.04</span></div><div class="line"></div><div class="line">    renderer.render(scene, camera)</div><div class="line">&#125;</div><div class="line"><span class="comment">// 添加文字</span></div><div class="line"><span class="keyword">var</span> loader = <span class="keyword">new</span> THREE.FontLoader();</div><div class="line">loader.load(<span class="string">'./js/font.json'</span>, <span class="function"><span class="keyword">function</span> (<span class="params">font</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> mesh = <span class="keyword">new</span> THREE.Mesh(<span class="keyword">new</span> THREE.TextGeometry(<span class="string">'Please press Up/Down/Ledt/Right or W/A/S/D'</span>, &#123;</div><div class="line">        <span class="attr">font</span>: font,</div><div class="line">        <span class="attr">size</span>: <span class="number">0.4</span>,</div><div class="line">        <span class="attr">height</span>: <span class="number">0.1</span></div><div class="line">    &#125;), <span class="keyword">new</span> THREE.MeshLambertMaterial());</div><div class="line">    mesh.position.set(<span class="number">-5</span>, <span class="number">2</span>, <span class="number">2</span>);</div><div class="line">    mesh.rotation.set(<span class="number">1.2</span>, <span class="number">0</span>, <span class="number">0</span>)</div><div class="line">    scene.add(mesh);</div><div class="line"></div><div class="line">    render();</div><div class="line">&#125;);</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment">// 添加按键时走动</span></div><div class="line"><span class="built_in">document</span>.addEventListener(<span class="string">'keydown'</span>, handleKeydown, <span class="literal">false</span>);</div><div class="line"></div><div class="line"><span class="comment">// 添加鼠标移动时事件</span></div><div class="line"><span class="built_in">document</span>.addEventListener(<span class="string">'mousemove'</span>, handleMousemove, <span class="literal">false</span>);</div><div class="line"><span class="comment">// 添加鼠标进入页面时初始化鼠标位置</span></div><div class="line"><span class="built_in">document</span>.addEventListener(<span class="string">'mouseenter'</span>, initMousePosition, <span class="literal">false</span>);</div><div class="line"></div><div class="line"><span class="comment">// 处理按键</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">handleKeydown</span>(<span class="params">e</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> e = e || <span class="built_in">window</span>.event;</div><div class="line">    <span class="keyword">var</span> keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;</div><div class="line"></div><div class="line">    <span class="keyword">if</span> (<span class="string">'37, 38, 39, 40, 65, 87, 68, 83'</span>.indexOf(keyCode) === <span class="number">-1</span>) &#123;</div><div class="line">        <span class="keyword">return</span>;</div><div class="line">    &#125; <span class="keyword">else</span> &#123;</div><div class="line">        <span class="keyword">switch</span> (e.keyCode) &#123;</div><div class="line">            <span class="keyword">case</span> <span class="number">37</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">65</span>:</div><div class="line">                CameraMove(<span class="string">'left'</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="number">38</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">87</span>:</div><div class="line">                CameraMove(<span class="string">'forward'</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="number">39</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">68</span>:</div><div class="line">                CameraMove(<span class="string">'right'</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="number">83</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">40</span>:</div><div class="line">                CameraMove(<span class="string">'backward'</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">        &#125;</div><div class="line">    &#125;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="comment">// 照相机移动计算</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">CameraMove</span>(<span class="params">direction</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> x, y;</div><div class="line">    <span class="keyword">var</span> oX = camera.position.x, oY = camera.position.y;</div><div class="line">    <span class="keyword">switch</span> (direction) &#123;</div><div class="line">        <span class="keyword">case</span> <span class="string">'left'</span>:</div><div class="line">            x = oX - move * <span class="built_in">Math</span>.cos(theta);</div><div class="line">            y = oY + move * <span class="built_in">Math</span>.sin(theta);</div><div class="line">            <span class="keyword">break</span>;</div><div class="line">        <span class="keyword">case</span> <span class="string">'forward'</span>:</div><div class="line">            x = oX + move * <span class="built_in">Math</span>.sin(theta);</div><div class="line">            y = oY + move * <span class="built_in">Math</span>.cos(theta);</div><div class="line">            <span class="keyword">break</span>;</div><div class="line">        <span class="keyword">case</span> <span class="string">'right'</span>:</div><div class="line">            x = oX + move * <span class="built_in">Math</span>.cos(theta);</div><div class="line">            y = oY - move * <span class="built_in">Math</span>.sin(theta);</div><div class="line">            <span class="keyword">break</span>;</div><div class="line">        <span class="keyword">case</span> <span class="string">'backward'</span>:</div><div class="line">            x = oX - move * <span class="built_in">Math</span>.sin(theta);</div><div class="line">            y = oY - move * <span class="built_in">Math</span>.cos(theta);</div><div class="line">            <span class="keyword">break</span>;</div><div class="line">    &#125;</div><div class="line">    camera.position.x = x;</div><div class="line">    camera.position.y = y;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="comment">// 初始化鼠标移动值</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">initMousePosition</span>(<span class="params">e</span>) </span>&#123;</div><div class="line">    mouseX = getMousePos(e || <span class="built_in">window</span>.event);</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="comment">// 获取鼠标坐标</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">getMousePos</span>(<span class="params">event</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> e = event || <span class="built_in">window</span>.event;</div><div class="line">    <span class="keyword">var</span> scrollX = <span class="built_in">document</span>.documentElement.scrollLeft || <span class="built_in">document</span>.body.scrollLeft;</div><div class="line">    <span class="keyword">var</span> scrollY = <span class="built_in">document</span>.documentElement.scrollTop || <span class="built_in">document</span>.body.scrollTop;</div><div class="line">    <span class="keyword">var</span> x = e.pageX || e.clientX + scrollX;</div><div class="line">    <span class="keyword">var</span> y = e.pageY || e.clientY + scrollY;</div><div class="line">    <span class="keyword">return</span> &#123; <span class="string">'x'</span>: x, <span class="string">'y'</span>: y &#125;;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="comment">// 处理鼠标移动</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">handleMousemove</span>(<span class="params">e</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> e = e || <span class="built_in">window</span>.event;</div><div class="line">    <span class="comment">// 获取鼠标x坐标</span></div><div class="line">    <span class="keyword">var</span> newMouseX = getMousePos(e).x;</div><div class="line">    <span class="comment">// 若值无效，更新坐标然后返回</span></div><div class="line">    <span class="keyword">if</span> (<span class="built_in">Number</span>.isNaN((newMouseX - mouseX) / r)) &#123; mouseX = newMouseX; <span class="keyword">return</span>; &#125;</div><div class="line">    <span class="comment">// 更新视角以及坐标位置</span></div><div class="line">    theta += (newMouseX - mouseX) / r;</div><div class="line">    mouseX = newMouseX;</div><div class="line"></div><div class="line">    <span class="comment">// 更新照相机焦点</span></div><div class="line">    renderCameraLookat();</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="comment">// 更新照相机焦点</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">renderCameraLookat</span>(<span class="params"></span>) </span>&#123;</div><div class="line">    camera.lookAt(<span class="keyword">new</span> THREE.Vector3(camera.position.x + far * <span class="built_in">Math</span>.sin(theta), camera.position.y + far * <span class="built_in">Math</span>.cos(theta), <span class="number">1</span>));</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>这节主要讲了给第一人称（照相机）添加鼠标移动控制视觉方向，并调整移动计算的基本过程。有兴趣的小伙伴，也可以自行完成上下移动视觉的部分。<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/three-notes/5-add-mouse-move" target="_blank" rel="external">此处查看项目代码</a><br><a href="http://three-notes.godbasin.com/three-notes-5-add-mouse-move/index.html" target="_blank" rel="external">此处查看页面效果</a></p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
	</div>
	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#添加鼠标移动控制"><span class="toc-number">1.</span> <span class="toc-text">添加鼠标移动控制</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#基本思路"><span class="toc-number">1.1.</span> <span class="toc-text">基本思路</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加监听事件"><span class="toc-number">1.2.</span> <span class="toc-text">添加监听事件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#绑定视角更新（照相机焦点处理）"><span class="toc-number">1.3.</span> <span class="toc-text">绑定视角更新（照相机焦点处理）</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#调整照相机移动方向"><span class="toc-number">1.4.</span> <span class="toc-text">调整照相机移动方向</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#完整代码"><span class="toc-number">1.5.</span> <span class="toc-text">完整代码</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
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